godan ~す verb / ~す verb (precursor to modern する) / transitive:

• to entrust (someone) with; to leave (a matter) with someone; to place under someone's care ➜ 託する
• to have someone deliver (a message, parcel, etc.); to send (through someone); to leave (a message) with someone
• to use (something) to express (one's feelings, opinion, etc.); to express in the form of (something)
• to use as a pretext